This belongs in the main work, because it a) fits one of the Thirty Kisses themes [#19 red], b) has a kiss in it [the girl kisses a log via Kawarimi, as you mentioned) and c) it focuses on both of the main characters Naruto [mainly] and Hinata.

Damn you Naruto! You're almost as oblivious as I once was! :D I simply loved reading this one. I can't wait to see more of the main story. :) I wish I knew where that challenge was, so that I could take it to. I'm going to do some googling and post my story if I can find the prompt.